Improvement in clamp-holders



i of the common forms.

UNITED STATES PATENT OFFICE.

GEORGE C. CONVERSE, 0F SPENCER, ASSIGNOR TO ABNER VVHEELOCK, OF CHARLTON, MASSACHUSETTS.

IMPROVEMENT Specification forming part of Letters Patent No. 152,830, dated July 7, 1874; application filed March 28, 1874.

To all whom it may concern Be it known that I, GEORGE C. CONVERSE, of Spencer, in the countyot' Worcester and Slate of Massachusetts, have invented certain Improvements in Clamp-Holders, of which the following is a specitication My invention relates to clamps used for holding the front, back, and Welt of boots and shoes (after being pricked) while the Workman sews the seam by hand. It is designed to raise or lower the clamp and to give it a partial vertical rotation, and also to tix and hold the clamp in any convenient position for ,y sewing the seam, and at the same time to be quickly shifted from one position to another.

It consists of a pivoted frame, which may be vibrated upon its standard or support and easily fixed by friction in any desired position, and having arms provided with suitable devices for holding the ends ot' the clamp, and for easy attachment and removal of the clamp, thus allowing-the clamp to be raised or lowered and to be held in any desired position for the workman to sew all parts of the seam.

The accompanying drawings show a clampl holder embodying my invention.

Figure l` is a side view f my improved clamp-holder. Figs. 2 and 3 show detached views of parts, which will be hereafter more fully described.

The clamp is seen at A, Fig. 1, havingjaws The V-shaped frame B is supported by the standard H and pedestal F, and nearly balanced upon the pivot I, in order to vibrate with ease. This vibrating frame carries the clamp A up or down and through a partial revolution, to adjust the clamp to suit the workman in vsewing the seam by hand in the usual way. The frame B is ixed in any desired position upon the standard H by means of the friction-plate J, which has a semicircular slot, through which the frictionpin K works. This pin draws the plate gently 5 against the standard, and thus holds the frame steady in place. A piece of leather or frictionpad, L, is placed in a recess in the side of the standard H and then by properly tightening the frictionpin K the frame B will be held in place and yet admit of being vibrated up and down bya slight pressure of the hand without changing the tension of the frictionpin K or moving the nut thereon. The clamp A is held on the arms ot' the frame B by placing one end of the clamp in the notch C, Fig. l, and the other end in the notch D, where it is retained by means of the spring E, better shown in Fig. 2. By this arrangement the clamp is easily inserted into the frame B and also easily removed. The workman, in using my clamp-holder, may drop the clamp into the frame, or take it out and adjust his work up or down without a moments delay or the movement of a screw or other slow-moving device; therefore my invention will save much time and also save the workman from great fatigue, by always holding the leather in the best position for sewing the seam.

I do not limit my invention to the precise form of the frameB. or to other precise devices, as these may be slightly changed with out departing from my invention so long as the vibrating' frame supports and carries the clamp and is held by friction, substantially as set forth.

Having described my invention, I claim- 

